It is thought to be the first time that the three places have been linked in relation to claims of historic sex abuse by influential Westminster figures.

Mr Kerr was abused at Kincora in the 1970s and claims he and two other boys were hand-picked to be trafficked to London in 1977 and sexually abused by men.

Both of the other men have since taken their own lives, Mr Kerr told Channel 4 News.

Insisting that the VIP paedophile ring did exist, he claims to have been abused in London by "men who had control and power over others", some of whom he believes were politicians.

His most violent experience allegedly took place at the Elm Guest House in Barnes, south London, where he claims to have been tied up with his hands behind his back while men took photographs.

When the guest house was raided by police in 1981 it was reported that officers had found whips, chains and ropes.

Mr Kerr also claimed to have been taken to Dolphin Square, a block of apartments near Parliament which is now at the centre of claims of alleged child abuse and murders being investigated by Scotland Yard.

He said: "I could have been 16, 15, 17 ... I remember going in with this guy. He told me to sit down and relax and explained about his glasses.

"He had Waterford Crystal and he wanted me to have a brandy and we had a small one. And then we had a sexual encounter in here."

Asked if he would name his abusers, he said: "I'm still in some fear. Even though I'm willing to take the courage.

"I need to know that I can have faith in our government but right now, when they're not willing to bring Kincora into Westminster, the message that sends to me is that there's some kind of cover-up and there has been."

Last July Theresa May, the Home Secretary, announced a major public panel inquiry into whether paedophiles were sheltered in government, the NHS, police, the courts and the BBC.

It has since been rocked by the resignations of two people selected to be its chair - Baroness Butler-Sloss and Fiona Woolf - following accusations that they were too close to the establishment to be independent.

In February it was announced that the inquiry would be chaired by Justice Dame Lowell Goddard, a New Zealand High Court judge.

Earlier this month, the Independent Police Complaints Commission (IPCC) said it is looking at 17 allegations of a police cover-up in relation to a VIP child sex abuse ring ranging from the 1970s to 2000s.

The full interview with Mr Kerr will be shown on Channel 4 News at 7pm.